CN207835170U - A kind of wireless power transmission systems based on low stress inverter - Google Patents
A kind of wireless power transmission systems based on low stress inverter Download PDFInfo
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- CN207835170U CN207835170U CN201820059709.2U CN201820059709U CN207835170U CN 207835170 U CN207835170 U CN 207835170U CN 201820059709 U CN201820059709 U CN 201820059709U CN 207835170 U CN207835170 U CN 207835170U
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Abstract
The utility model discloses a kind of wireless power transmission systems based on low stress inverter, including low stress inverter, emitting portion, receiving portion and load, high frequency power source of the low stress inverter as wireless power transmission systems, emitting portion includes transmitting coil and the first capacitance for being connected with the transmitting coil, receiving portion includes receiving coil and the second capacitance for being connected with the receiving coil, and the electric energy received is transmitted to load by receiving portion.The characteristics of the utility model：First, the switching tube of inverter has lower voltage stress；Second, inverter has higher electric energy efficiency of transmission；Third, the working frequency of system is up to MHz or more.In practical applications, corresponding power grade and frequency can be designed according to demand.
Description
Technical field
The utility model is related to the technical fields of wireless power transmission, refer in particular to a kind of nothing based on low stress inverter
Line transmission system.
Background technology
Radio energy transmission system medium-high frequency inverter has been a hot spot of research problem, common high frequency inverter
There are E classes inverter, D classes inverter, full bridge inverter.It is inverse that D classes inverter, full-bridge are commonly used in the larger application occasion of power
Become circuit, in high frequency, the driving of upper tube needs to add bootstrapping or isolation circuit to reach the mesh that the ground driven with down tube is isolated
, this undoubtedly increases the design difficulty of entire inverter, and in upper and lower bridge arm two switching tubes due to electromagnetic interference false triggering
It simultaneously turns on, prodigious electric current is flowed through on switching tube, to burn switching tube, thus the work of D classes inverter, full bridge inverter
Working frequency is very restricted.E class inverters only use a switching tube, thus can be operated in higher frequency, but E classes
Switching tube has larger switch stress in inverter, thus the power grade of entire circuit is limited by very large.
Utility model content
The shortcomings that the purpose of the utility model is to overcome the prior arts with it is insufficient, it is proposed that it is a kind of it is reasonable for structure it is reliable,
The wireless power transmission systems simply based on low stress inverter are controlled, the working frequency of system is up to MHz or more, in practical application
In, corresponding power grade and frequency can be designed according to demand.
To achieve the above object, technical solution provided by the utility model is：A kind of nothing based on low stress inverter
Line transmission system, including low stress inverter, emitting portion, receiving portion and load；The low stress inverter includes direct current
Voltage source, choking-winding, switching tube, resonant inductance, resonant capacitance, paralleled power switches capacitance, the emitting portion include transmitting
Coil and the first capacitance being connected with the transmitting coil, the receiving portion include receiving coil and are connected with the receiving coil
The electric energy received is transmitted to load by the second capacitance, the receiving portion；Wherein, the cathode of the direct voltage source respectively with
The source electrode of switching tube, one end of paralleled power switches capacitance, one end of resonant inductance are connected, and the other end of the resonant inductance is harmonious
Shake capacitance one end be connected, the other end leakage with the other end, switching tube of paralleled power switches capacitance respectively of the resonant capacitance
Pole, one end of choking-winding, transmitting coil one end be connected, the other end of the choking-winding and the anode of direct voltage source,
One end of first capacitance is connected, and the other end of first capacitance is connected with the other end of transmitting coil, the receiving coil
One end is connected with one end of the second capacitance, and the other end of second capacitance is connected with one end of load, the load and reception
The other end of coil is connected.
When the low stress inverter is operated in optimum state, meets no-voltage and open the item opened with no-voltage derivative
Part.
The working frequency of the low stress inverter, the resonant frequency phase of the resonant frequency of emitting portion and receiving portion
Together.
The frequency range is 0.5MHz~50MHz.
The resonant inductance, resonant capacitance resonant frequency be 2 times of switching frequency.
The utility model compared with prior art, has the following advantages that and advantageous effect：
1, a switching tube both ends LC branch in parallel in low stress inverter, LC resonance at twice of switching tube frequency,
Channel is provided for the second harmonic of circuit, thus the voltage stress of switching tube can be reduced.
2, it can make low stress inverter is operated in no-voltage and opens to be led with no-voltage when designing suitable circuit parameter
Number is open-minded so that low stress inverter has higher efficiency.
Therefore, the low stress inverter of the utility model is well suited as radio energy transmission system medium-high frequency inversion electricity
Source, and the working frequency of system is up to MHz or more.In practical applications, corresponding power grade and frequency can be designed according to demand.
Description of the drawings
Fig. 1 is the circuit diagram of Tthe utility model system.
Fig. 2 is the circuit diagram of low stress inverter.
Fig. 3 is the analogous diagram of Tthe utility model system.
Fig. 4 is the simulation waveform of Tthe utility model system.
Specific implementation mode
With reference to specific embodiment, the utility model is described in further detail.
As shown in Figure 1, the wireless power transmission systems based on low stress inverter that the present embodiment is provided, including low stress are inverse
Become device (high frequency power source as wireless power transmission systems), emitting portion, receiving portion and load RL2；The low stress inverter
Including direct voltage source uDC, choking-winding LF, switching tube Q, resonant inductance LM, resonant capacitance CM, paralleled power switches capacitance CF, institute
It includes transmitting coil L to state emitting portion1And with transmitting coil L1The first connected capacitance C1, the receiving portion includes receiving
Coil L2And with receiving coil L2The second connected capacitance C2, the receiving portion by the electric energy received be transmitted to load RL2；
Wherein, the direct voltage source uDCCathode respectively with the source electrode of switching tube Q, paralleled power switches capacitance CFOne end, resonance electricity
Feel LMOne end be connected, the resonant inductance LMThe other end and resonant capacitance CMOne end be connected, the resonant capacitance CMIt is another
One end respectively with paralleled power switches capacitance CFThe other end, the drain electrode of switching tube Q, choking-winding LFOne end, transmitting coil L1's
One end is connected, the choking-winding LFThe other end and direct voltage source uDCAnode, the first capacitance C1One end be connected, it is described
First capacitance C1The other end and transmitting coil L1The other end be connected, the receiving coil L2One end and the second capacitance C2's
One end is connected, the second capacitance C2The other end and load RL2One end be connected, the load RL2With receiving coil L2It is another
One end is connected.
When low stress inverter is operated in optimum state, meets no-voltage and open the condition opened with no-voltage derivative.It is low
The working frequency of stress inverter, the resonant frequency of emitting portion are identical with the resonant frequency of receiving portion, and frequency range is
0.5MHz~50MHz.Resonant inductance LM, resonant capacitance CMResonant frequency be 2 times of switching frequency.
The circuit of low stress inverter is as shown in Fig. 2, the design of its design parameter is analyzed as follows：
If the peak point current for flowing through load is iRL1, initial phase isThe expression formula that load current can then be write out is as follows：
In a cycle that switching tube turns on and off, it is 0≤ω t ＜, 2 π D, switching tube to enable the time that switching tube is connected
The time of disconnection is 2 π D≤ω t ＜, 2 π.
When switching tube conducting, i.e. 0≤ω t, 2 π D of ＜, the electric current that switching tube can must be flowed through by KCL equations is：
iQ(ω t)=iDC-iM(ωt)-iRL1(ωt) (2)
When switching tube is connected, the electric current for flowing through this network is：
Formula (3) is brought into (2) and can be obtained：
When switching tube shutdown, i.e. 2 π D≤ω t 2 π of ＜, resonant network L is flowed throughMCMElectric current be：
iM(ω t)=iDC-iRL1(ωt)-iCF(ωt) (5)
Capacitance C in formula (5)FElectric current：
When switching tube turns off, resonant network LMCMTerminal voltage be equal to switching tube both ends voltage：
To formula (7) the right and left while differential：
Convolution (5), formula (6) and formula (8) can obtain：
Shown in the general solution such as formula (10) for solving formula (9)：
It enables in formulaFormula (10) abbreviation is as follows：
It can be obtained by formula (9) and formula (11) and pass through capacitance CFElectric current be：
The drain voltage that switching tube can be obtained by formula (6) and (12) is：
According to the voltage volt-seconds area balance on input inductance, it is known that the DC component of choke inductance pressure drop is zero, can
Know that the average value of switching tube drain voltage is equal to direct current power source voltage, formula (13) is averaged and can be obtained：
By formula (14), and the drain voltage of switch tube does normalized, can obtain：
In order to ensure that the Effec-tive Function of entire inverter, inverter need to meet ZVS and ZVDS conditions, by formula (12) and formula
(13) it can obtain：
uQ(2 π)=0 (16)
iCF(2 π)=0 (17)
It by formula (3) and formula (11), can obtain in one cycle, flow through inductance LMCurrent expression it is as follows：
When boundary condition is turned on and off by switching, electric current and the voltage condition of continuity determine, i.e.,
iM(2πD-)=iM(2πD+) (19)
iM(0)=iM(2π) (20)
Because only considering the fundamental wave and triple-frequency harmonics of switching tube drain voltage, enable in formula (13)Solve k=
1.25。
The voltage stress of switching tube can be determined by formula (12)：
The factors such as the voltage stress and current stress of stability, switching tube based on circuit consider that selection duty ratio is D=
0.4.Convolution (16), (17) and (19)~(22) can obtain corresponding parameter:A1=-1.15, A2=-0.47, B1=-0.11, B2
=-1.28,IRL1/iDC=2.87.
Bringing above-mentioned parameter into formula formula (16) can obtain：
Assuming that the power of DC side is completely transferred in load, by power conservation：
Convolution (24) and formula (25) can obtain：
By formula (26) and IRL1/iDC=2.87, capacitance C can be obtainedFCalculating it is as follows：
BecauseConvolution (27), then capacitance CMCalculating it is as follows：
Inductance LMWith capacitance CMOne resonant network of composition, the switching frequency that resonant frequency is twice, convolution (28), then
Inductance LMCalculating it is as follows：
Switching tube drain voltage passes through LSAnd CSResonant network, only fundamental wave component pass through, that is, the impedance part exported can be with
Obtained by the fundamental wave component of switching tube drain voltage, the real part and output current of output impedance with mutually and the imaginary part of output impedance and
Output current is orthogonal:
The voltage of switch tube carries out Fourier analysis：
Inductance LXIt can be calculated by following formula：
Formula (30) is brought into formula (31) and is obtained：
Capacitance CSCan be determined by following formula：
QLFor loaded quality factor, it is generally chosen for 5~20.
Inductance LSWith capacitance CSResonance, resonant frequency are switching frequency, inductance LSCalculating it is as follows:
Choking-winding inductance LFIt is required that sufficiently large to inhibit the ripple current of DC side, choking-winding inductance LFIt is general full
Foot：
It is designed according to above analysis.Here one group of wireless power transmission systems sample based on low stress inverter is provided, directly
Galvanic electricity presses uDC=20V, switching frequency f=1MHz, duty ratio D=0.4, the inductance L of receiving coil2=40 μ H, receiving coil
Internal resistance R2=0.1 Ω loads RL2=100 Ω, capacitance C1=C2Load conversion is obtained R by=633.25PF to transmitting terminalL1=6.31
Ω, the choking-winding L of low stress inverterF=150 μ H, inductance LM=1.44 μ H, capacitance CM=4.398nF, capacitance CF=
3.5185nF inductance Ls+LX=10.04 μ H, capacitance CS=2.981nF, by inductance LSAnd LXIt is merged into transmitting coil, can set
Count the self-induction L of transmitting coil1=50.04 μ H, the internal resistance R of transmitting coil1=0.12 Ω, C1=3.614nF, according to the above parameter
Wireless power transmission PSIM emulation can be established as shown in figure 3, obtaining corresponding simulation result as shown in figure 4, as can be seen from Figure 4
Two switching tubes meet the requirement of Sofe Switch.
Embodiment described above is only the preferred embodiment of the utility model, and the implementation of the utility model is not limited with this
Range, therefore change made by all shapes according to the utility model, principle, it should all cover within the protection scope of the present utility model.
Claims (4)
1. a kind of wireless power transmission systems based on low stress inverter, it is characterised in that：Including low stress inverter, emission part
Point, receiving portion and load；The low stress inverter includes direct voltage source, choking-winding, switching tube, resonant inductance, humorous
Shake capacitance, paralleled power switches capacitance, and the emitting portion includes transmitting coil and the first capacitance for being connected with the transmitting coil, institute
It includes receiving coil and the second capacitance for being connected with the receiving coil to state receiving portion, the electric energy that the receiving portion will receive
It is transmitted to load；Wherein, the cathode of the direct voltage source respectively with the source electrode of switching tube, paralleled power switches capacitance one end,
One end of resonant inductance is connected, and the other end of the resonant inductance is connected with one end of resonant capacitance, the resonant capacitance it is another
One end respectively with the drain electrode of the other end, switching tube of paralleled power switches capacitance, one end of choking-winding, transmitting coil one end phase
Even, the other end of the choking-winding is connected with one end of the anode of direct voltage source, the first capacitance, first capacitance it is another
One end is connected with the other end of transmitting coil, and one end of the receiving coil is connected with one end of the second capacitance, second electricity
The other end of appearance is connected with one end of load, and the load is connected with the other end of receiving coil.
2. a kind of wireless power transmission systems based on low stress inverter according to claim 1, it is characterised in that：It is described low
The working frequency of stress inverter, the resonant frequency of emitting portion are identical with the resonant frequency of receiving portion.
3. a kind of wireless power transmission systems based on low stress inverter according to claim 2, it is characterised in that：The frequency
Rate ranging from 0.5MHz~50MHz.
4. a kind of wireless power transmission systems based on low stress inverter according to claim 1, it is characterised in that：It is described humorous
Shake inductance, resonant capacitance resonant frequency be 2 times of switching frequency.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820059709.2U CN207835170U (en) | 2018-01-15 | 2018-01-15 | A kind of wireless power transmission systems based on low stress inverter |
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| CN201820059709.2U CN207835170U (en) | 2018-01-15 | 2018-01-15 | A kind of wireless power transmission systems based on low stress inverter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108123554A (en) * | 2018-01-15 | 2018-06-05 | 华南理工大学 | A kind of wireless power transmission systems based on low stress inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108123554A (en) * | 2018-01-15 | 2018-06-05 | 华南理工大学 | A kind of wireless power transmission systems based on low stress inverter |
| CN108123554B (en) * | 2018-01-15 | 2024-04-12 | 华南理工大学 | Wireless power transmission system based on low-stress inverter |
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